Stone guard for dual pneumatic tires



Aug. 21, 1923.

S. P. THACHER STONE GUARD FOR DUAL PNEUMATIC TIRES Filed July 13 1 922 Elvwewtoz. die/0 0k]? T240289,

Put-med Au 21, 1923.

UNITED STATES FICE.

SHELDON P. TEACHER, OF FREE-HOLD, NEW JERSEY, ASSIGNOB TO MORGAN & WRIGHT, A CORPORATION OF MICHIGAN.

STONE GUARD FOR DUAL PNEUMATIC TIRES.

Application filed Jul 13,1922. Serial no. 574,828.

To all whom it may concern:

Be it known that I, Summon P. Tnaomin,

a citizen of the United States, residing at Freehold, county of Monmouth, and State of New Jersey, have invented certain new and useful Improvements in Stone Guards for Dual Pneumatic Tires, of which the following is a full, clear, and exact description. 1

This invention relates to pneumatic tire casings and more articularly to a construction therefor a apted to exclude stones. Frequently, a pair f pneumatic tires are mounted in juxtaposition on the wheehof a vehicle, such as a truck, instead of a single large pneumatic. This is known as dual or twin mounting. One of the main objections to this practice is the tendency of the contiguous casings, as heretofore constructed, to pick up stones which, becoming wedged between the casing, rapidl wear out the side walls and cause early ailure of one or both tires. An object of the present invention is to revent stones or other foreign matter from coming lodged between the side walls of juxtaposed or dual casings and thereby prolon their life when mounted 1n pairs on a sin e wheel.

embodiment of the invention is illustrated in the accompanying drawing in cross-section, showing conventionally a dual mounting.

In the drawings, a pair of casings 1 and 2 of the straight side type equipped with wired margins3 are shown mounted on diskwheels 4 and 5, placed back to back and adapted to be supported on the axle spindle in a well-known manner. This mounting may be employed or two separate rims may be mounted on a felloeband after the fashion of dual solids The mounting of the easings, of course, forms no part of the present invention.

According to my invention, the side walls of the casings aremolded with integral annular projections 6, preferably havlng substantially flat faces .7, extending approximately parallel to the plane of each casing and of greater width radially than thick transversely. These annular projections are preferably located, as shown, at the be varied within wide limit greatest bulge in the side Walls and for a istance radially inward and outward thereof so as not to interfere with the ordinary and usual deflection of a casing under load or to hamper access to the beaded margins of the casing when being mounted. The projections may be located on either or both of the side walls of each casing and may be formed either by molding with the casings during the cure or by cementing a stri of durab e rubber composition to one or oth of their side walls after curing, the cement, if used, being preferably of the cold or self-curing kmd. A toughening agent, such as zinc oxide, may be incorporated in the composition before curing. After ouring, the faces 7 may be indurated by brushing with bromine chlorine, or other halogen, in dilute solution, about say 3%, such treatment imparting to the faces a leathery character.

It will be obvious that the form, shape and location of the annular proi'pctions may s. articularly, their thickness may be proportioned so that the opposed faces 7 may be either slightly separated or in contact whenthe casings are either deflected or not deflected, the essential thing being to so locate them as to largely, if not entirely, exclude stones or other foreign matter of a character likely, if lodged between the casings, to abrade and injure the side walls thereof.

It will therefore be understood that many changes may be made in the construction without departure from the broad underlying principles of the invention and reference should be made to the accompanying claims for an understanding of its scope.

Having thus described my invention, what I claim and desire to protect by Letters Patent is: o

1. Apneumatic tire casing having integral annular projections on its side walls with substantially flat faces approximately parallel to the plane of the casing'and of greater width radially than transversely of the casing, one of said annular projections being adapted to co-operate with a similar projection on another casing so ,.as to exclude stones.

2. Twinpneumatic tire casings for dual" mounting on motor vehicles having on their adjacent side walls annular projections adapted in opposition to exclude stones from lodgment between the casings.

3 Twin pneumatic tire casings for dual mounting on motor vehicles having on their adjacentvside walls integral annular projections'with opposed substantially flat faces adapted to contact with one another and exclude stones from lod ment therebetween Signed at New Yor city county of New York, and State of New h'ork, this 12th day of July, 1922.

SHELDON P. THACHER. 

